Author : William Carl Kalb
Publisher :
Page : 334 pages
File Size : 17,4 MB
Release : 1979
Category : Catalysis
ISBN :
[PDF] Synthetic And Mechanistic Studies Pertaining To Catalysis By Metallocarboranes eBook
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Synthetic and Mechanistic Studies Related to Closo and Exo-nido-bis(phosphine)rhodacarboranes in Catalysis
Author : John Danforth Hewes
Publisher :
Page : 448 pages
File Size : 15,24 MB
Release : 1984
Category : Catalysis
ISBN :
Synthetic, Kinetic, Mechanistic, Crystallographic and Dynamic FTNMR Studies of Metallocarboranes
Author : Todd Benjamin Marder
Publisher :
Page : 916 pages
File Size : 38,77 MB
Release : 1981
Category : Metallocarboranes
ISBN :
Part I, Kinetic and Mechanistic Studies of Phosphinorhodacarborane Complexes as Homogeneous Catalysts. Part II, Synthetic Studies of Phosphinorhoda- and Nickelacarborane Complexes
Author : Roswell Easton King
Publisher :
Page : 638 pages
File Size : 48,23 MB
Release : 1982
Category : Hydrogenation
ISBN :
Synthetic, Kinetic and Mechanistic Studies with Rhoda- and Ruthenacarborane Clusters
Author : Paul Edward Behnken
Publisher :
Page : 374 pages
File Size : 21,59 MB
Release : 1984
Category : Carboranes
ISBN :
Comprehensive Dissertation Index
Author :
Publisher :
Page : 862 pages
File Size : 33,64 MB
Release : 1984
Category : Dissertations, Academic
ISBN :
Vols. for 1973- include the following subject areas: Biological sciences, Agriculture, Chemistry, Environmental sciences, Health sciences, Engineering, Mathematics and statistics, Earth sciences, Physics, Education, Psychology, Sociology, Anthropology, History, Law & political science, Business & economics, Geography & regional planning, Language & literature, Fine arts, Library & information science, Mass communications, Music, Philosophy and Religion.
Mechanistic Studies of Catalysis and Molecular Recognition by Synthetic Supramolecular Enzyme Mimics
Author : David Melvin Kaphan
Publisher :
Page : 159 pages
File Size : 22,99 MB
Release : 2016
Category :
ISBN :
Chapter 1 - A summary and overview of the application of self-assembled synthetic microenvironment catalysts is presented. The various clusters for which catalytic applications have been reported are introduced together, grouped by mechanism of self-assembly (i.e. hydrogen bond network or metal ligand coordination). The examples of catalysis are then discussed in the context of the nature of charge buildup in the transition state, with neutral reactions presented first, followed by reactions that develop anionic charge in the transition state, and finally reactions that develop cationic charge in the transition state. Chapter 2 - The tetrahedral [Ga4L6]12- supramolecular assembly developed in the Raymond group is shown to catalyze a bimolecular aza-Prins cyclization featuring an unexpected transannular 1,5-hydride transfer. This reaction pathway is promoted by the constrictive binding of the interior microenvironment of the cluster, and is kinetically inaccessible in bulk solution. A thorough investigation of the mechanism of this process is presented, including isotope labeling studies and kinetic analysis, indicating that the rate limiting step of the process is encapsulation of a transiently formed iminium ion and supports the proposed 1,5-hydride transfer pathway. This work represents a striking example of the enzyme-like ability of synthetic microenvironment catalysts to selectively modulate kinetic barriers in order to promote otherwise inaccessible selectivity. Chapter 3 - Catalysis of alkyl-alkyl reductive elimination from high valent transition metal complexes [such as gold(III) and platinum(IV)] by the [Ga4L6]12- Raymond cluster is described. Kinetic experiments delineate an enzyme-like Michaelis-Menten mechanism, with rate accelerations (kcat/kuncat) up to 1.9 × 107. Indirect evidence for the intermediacy of a coordinatively unsaturated encapsulated species is garnered from the observation of several persistent donor-arrested inclusion complexes, including a crystallographically characterized gold(III) cation. The catalysis of reductive elimination is further incorporated into a dual-catalytic cross coupling for which the presence of the supramolecular cluster is necessary in order to achieve efficient turnover, and the full catalytic cycle of this process is elucidated through a series of stoichiometric experiments. Chapter 4 - A novel supramolecular assembly of M4L4 stoichiometry is reported for which the addition of a guest effects an increase from S4- to T-symmetry. A mechanistic investigation of this guest-induced host isomerization revealed that the guest binding occurs by a mechanism similar to the conformational selection model for ligand binding in proteins. A comprehensive study of this simple system provides insight into analogous behavior in biophysics and enzymology, as well as important information to support future efforts in the design of more efficient self-assembled microenvironment catalysts.
Dissertation Abstracts International
Author :
Publisher :
Page : 680 pages
File Size : 41,31 MB
Release : 1980
Category : Dissertations, Academic
ISBN :
Mechanistic Studies in Organometallic Chemistry and Homogeneous Catalysis: New Insights and Novel Catalyst System
Author : HORVÁT ISTVÁN T.
Publisher :
Page : 0 pages
File Size : 42,79 MB
Release : 1997
Category :
ISBN :
Synthetic, Mechanistic, and Catalytic Studies of Nickel- and Palladium-catalyzed Carboxylation with Carbon Dioxide
Author : Hee Won Suh
Publisher :
Page : 330 pages
File Size : 48,74 MB
Release : 2015
Category :
ISBN :